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    <title>3-Array.prototype.flat与flatMap</title>
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    <script>
        // flat 平
        // 将多维数组转化为低维数组
        // const arr = [1, 2, 3, 4, [5, 6]];
        // const arr = [1, 2, 3, 4, [5, 6, [7, 8, 9]]];
        // 参数为深度 是一个数值
        // console.log(arr.flat(2));

        // flatMap
        const arr = [1, 2, 3, 4];
        const result = arr.flatMap(item => [item * 10])
        console.log(result);
    </script>
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